YANBU. I used to smoke (2 years FREEEEEEE now!!) and when we first moved to our flat I used to smoke outside. The upstairs neighbour quite reasonably and pleasantly asked me to smoke further away from the flat for the very same reason.
She was really reasonable, none aggressive (or passive aggressive) and not at all judgy so I completely understood, didn't mind and moved further away.
Don't know what to do about the cars though...Are you able to jokily ask if he's trying to fume you out of your house or something?